Instruction Manual
4875 Power Controller
www.parrinst.com
5
ex P l a n a t I o n  o f  sy m b o l s
I On position
O Off Position
This CAUTION symbol may be present on the Product Instrumentation 
and literature. If present on the product, the user must consult the 
appropriate part of  the accompanying product literature for more 
information.
Protective Earth (PE) terminal. Provided for connection of the protective 
earth (green or green/yellow) supply system conductor.
In t e n d e d  us a g e
This controller has been designed for use with Parr 
Pressure Vessels and Reactors. This controller is 
to be used solely with Parr Instrument Company 
Heaters, motors, and/ or cooling components. It 
has been designed, built, and tested to strict physical 
and electrical standards. However, it is the user's 
responsibility to install and operate it in conformance 
with local pressure and electrical codes. 
If the instrument is used in a manner not specified by 
Parr Instrument Company, the protection provided by 
the equipment may be impaired.
cl e a n I n g  & ma I n t e n a n c e
Periodic cleaning may be performed on the exterior 
surfaces of the controller with a lightly dampened cloth 
containing mild soap solution. All power should be 
disconnected and the power cord should be unplugged 
when cleaning the controller. 
There are no user serviceable parts inside the product 
other than what is specifically called out in this manual. 
Advanced troubleshooting instructions beyond the 
scope of this manual can be obtained by calling Parr 
Instrument Company in order to determine which 
part(s) may be replaced or serviced.
sa f e t y  In f o r m a t I o n
To avoid electrical shock, always:
Use a properly grounded electrical outlet of correct 1. 
voltage and current handling capability.
Ensure that the equipment is connected to electrical 2. 
service according to local national electrical codes. 
Failure to properly connect may create a fire or 
shock hazard.
For continued protection against possible hazard, 3. 
replace fuses with same type and rating of  fuse.
Disconnect from the power supply before 4. 
maintenance or servicing.
To avoid personal injury:
Do not use in the presence of flammable or 1. 
combustible materials; fire or explosion may result. 
This device contains components which may ignite 
such material.
Refer servicing to qualified personnel.2. 










